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System Sensor L-Series offers a wide range of Audible Visible (AV) accessories to enable you to meet a variety of application requirements
strobe synchronization
• Alarm Signaling: Display and relay alarm signaling
System Sensor DNR Intelligent Photoelectric Duct Detector
Siemens FDO421 (S54320-F4-A1) Smoke Detector Sale System Sensor L-Series offers aSiemens FDO421 (S54320 F4 A1) Photoelectric Smoke Detector Model FDO421 incorporates an optical sensor using a light scattering detection principle. The device utilizes advanced software algorithms to analyze the signals and provides highly stable and accurate smoke detection. Model FDO421 also uses state of the art microprocessor circuitry with error checks, detector self diagnostics, and supervision programs. Each detector is UL 268 7th edition
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